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Hikers exploring the very active hot spring area at Kerlingarfjoll, where Kerlingarfjoll Mountains in the interior are a massif of rhyolitic domes rising to 1477m, Iceland, Polar Regions
Jokulkvisl River and valley at the foot of Kerlingarfjoll Mountains, a majestic massif of rhyolitic domes, Iceland, Polar Regions
Dyrholaey inselberg and cliffs, southernmost point of Iceland, from the low-lying coast near Vik, Iceland, Polar Regions
Mount Krakatindur, 858 m, standing solitary in the Nyjahraun lava field, east of Hekla volcano in the distance, Fjallabak route north (Nyrdri-Fjallaback) in the interior, Iceland, Polar Regions
Landscape of the interior from the F-208 route (Fjallabak route north, Nyrdri-Fjallabak) between Holaskjol and Landmannalaugar, south Iceland (Sudurland), Iceland, Polar Regions
Hikers exploring the active hot spring area at Kerlingarfjoll, Iceland, Polar Regions
Lac Abbe (Lake Abhe Bad) with its chimneys, Republic of Djibouti, Africa
Laugahraun lava field seen from the slopes of Blahnukur, Landmannalaugar area, Fjallabak region, Iceland, Europe
Landscape of the interior from the F-208 route (Fjallabak route north, Nyrdri-Fjallabak) between Holaskjol and Landmannalaugar, south Iceland (Sudurland), Iceland, Polar Regions
Fjallsarlon glacial lake and Fjallsjokull (Oraefajokull) glacier near Jokulsarlon glacial lagoon, south-east Iceland (Austurland), Iceland, Polar Regions
Hikers taking a rest above the Skaftafellsjokull glacier, Skaftafellsa glacial river in the background, in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions
Bourke's Luck Potholes, created by river erosion, Blyde River Canyon, Mpumalanga, South Africa, Africa
A hiker on Poon Hill looks towards Dhaulagiri Himal, Annapurna Conservation Area, Dhawalagiri (Dhaulagiri), Western Region, Nepal, Asia
Crater lake of Volcan Santa Ana, 2365m, Parque Nacional Los Volcanes, El Salvador, Central America
Erosion helps form stunning formations in the rocks of the Coloured Canyon, Sinai South, Egypt, North Africa, Africa
Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific Ocean.
Huliba limestone caves, Arikok National Park, Aruba (Dutch Antilles), West Indies, Caribbean, Central America
Hato Caves, limestone caves open to visitors on the north coast of Curacao (Dutch Antilles), West Indies, Caribbean, Central America
Devil's Marbles, the result of spheroidal weathering of strong granite beneath an ancient soil, Tennant Creek, Northern Territory, Australia, Pacific
Tourists walking on lava flow on Isla Santiago, Sullivan Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Columnar basalt, Vikingbukta (Viking Bay), Scoresbysund, Northeast Greenland, Polar Regions
Rio Aragon Subordan and upper Hecho valley overlooked by karst limestone peaks and woods, Huesca, Aragon, Spain, Europe
Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe
Karst limestone sea cliffs at Pria, with Picos de Europa mountains in the background, near Llanes, Asturias, Spain, Europe
Castro de Gaviotas (Gull's fort) karst limestone rock archway, and La Canalina bay, near Llanes, Asturias, Spain, Europe
Osum Gorge near Berat, Albania, Europe
View from cliff tops down into Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
Hound Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe
Waterfall in summer sunshine at Foss a Sidu, South coast, Iceland, Polar Regions
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Hot air ballooning over rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
The Worm's Head with causeway exposed at low tide, Rhossili, The Gower peninsula, Wales, United Kingdom, Europe
Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Pastel shades of pebbly beach at Bossington in Somerset, England, United Kingdom, Europe
In the red tsingy area, close to Diego Suarez bay, Northern Madagascar, Africa
Hiker on walkway admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Berne, Switzerland, Europe
Salina Turda, underground salt mine tourist attraction in Turda city, Romania, Europe
Rudolf Mine in Salina Turda salt mine in Turda city, Romania, Europe
Underground lake in the Salt Mine, Salina Turda museum in Transylvania, Romania, Europe
Rudolf Mine in Salina Turda salt mine in Turda city, Romania, Europe
Tunnel of Salina Turda, well known landmark in Turda, Transylvania, Romania, Europe
The Olgas (Kata Tjuta) at sunrise, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Views from the Nadab lookout, at the sacred Aboriginal site of Ubirr, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe
The Saddle of Cathedral Rock, Sedona, Arizona, United States of America, North America
The Saddle of Cathedral Rock, Sedona, Arizona, United States of America, North America
Devils Bridge, Sedona, Arizona, United States of America, North America
Cracked earth and rocks in the Outback of South Australia, Australia, Pacific
Sand depressions in the flood plain of the Haast River valley at the start of the main divide, Haast, Westland, South Island, New Zealand, Pacific
Zanskar River, Ladakh, Indian Himalayas, India, Asia
Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Devils Punchbowl Falls, 131m high, on walking track in mountain beech forest, Arthur's Pass National Park, Southern Alps, Westland, South Island, New Zealand, Pacific
Volcanic rock formations on south eastern coast, Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe
Fairy chimney rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Peyto Lake, Mount Patterson and Mistaya valley, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America
Recent pahoehoe basalt lavas, Erte Ale volcano, Danakil Depression, Ethiopia, Africa
Close-up of coloured sandstone from which the Nabateans carved their city, Petra, Jordan, Middle East
Beachy Head, East Sussex, England, United Kingdom, Europe
Phallic pillars or fairy chimneys, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Sacred Valley of the Inca, Urubamba, Peru, South America
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Eshaness basalt cliffs, Calder's Geo, ancient volcanic crater, coast deeply eroded with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
Ancient prehistoric stone boulder and bare limestone pavement, The Burren, County Clare, West of Ireland
Ait Ben-Haddou, Morocco, North Africa, Africa
Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Severe erosion of loose Quaternary glacial sands on this coast that has retreated more than 500m since the1830s, Covehithe, Suffolk, England, United Kingdom, Europe
Walkers on a narrow mountain road above the Cares Gorge, 1000m deep, 12km limestone gorge, in the Picos de Europa mountains in Cantabria, Spain, Europe
Eroded rocks under an overcast stormy sky, the Painted Desert, Arizona, United States of America (USA), North America
Late winter hiker on Tongariro Crossing, Mount Ngauruhoe and South Crater, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Isla de los Pescadores in centre, salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Travertine terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
Rock formations and coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Flamborough Head, East Yorkshire, Yorkshire, England, United Kingdom, Europe
Different coloured rocks in the Red Valley, Orthaisar, Cappadocia, Anatolia, Turkey, Eurasia
Steam plume off boiling acid lake, Naka-dake active crater, Aso volcano, Kyushu, Japan, Asia
Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
One of many picturesque waterfalls in the valley of the Rio Pastaza that flows from the Andes to the upper Amazon Basin, near Banos, Ambato Province, Central Highlands, Ecuador, South America
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Curved stalactites and wall flowstone of pure salt, in cave in Namakdan salt dome, Qeshm Island, southern Iran, Middle East
Bhimbetka Caves with Neolithic paintings in rock shelters in sandstone, Obaidullaganj hills, Bhopal, Madhya Pradesh, India, Asia
Sand dunes of Maspalomas and seaside, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Cinder cones in the centre of the island near Tinajo, a relic of the island's active volcanic past, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe
Huge stone towers in the Ucka Canyon, Istria, Croatia, Europe
Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions
Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions
Summit crater, Volcan Cotopaxi, 5897m, the highest active volcano in the world, Ecuador, South America
Columnar basalt, Vikingbukta (Viking Bay), Scoresbysund, Northeast Greenland, Polar Regions
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Diana Point, Al Jabal Al Akkar region, Hajar Mountains, Sultanate of Oman, Middle East
Landscape of the Swat River valley in Pakistan, Asia
Batu Caves, near Kuala Lumpur, Malaysia, Southeast Asia, Asia